Symmetrically shaped, flat, and soft nipple . Its shape mimics the maternal nipple for a breastfeeding experience thats similar to that of a mother. For easy combination between breast and bottle.Reduces colic and discomfort - 80% of mothers reported fewer colic symptoms 2 With the unique self-sterilization function - easy and fast in just 3 minutes Easy to fill, use and clean 1. PROTECTIVE COVER Spill-proof; also serves as a measuring cup. 2. SKINSOFT TM SILICONE TEAT Unique symmetrical and flat shape: just like a mothers breast during breastfeeding. With a silky-smooth silicone surface for a familiar feel. 94% of babies accept our bottles nipple . 3. WIDE OPENINGS Easy to fill, use and clean 4. VENTILATED BASE Ventilated base with vents allows for a regular flow of fluid and prevents baby from swallowing air. Reduces colic and discomfort. .